Minimal lepton flavour structures lead to non-maximal 2-3 mixing

Michele Frigerio (1) , Albert Villanova del Moral (2)

1 IFAC - Interactions fondamentales, Astroparticules et Cosmologie
2 IFAC

Present data prefer a large but non-maximal 2-3 mixing in the lepton sector. We argue that this value, in connection with $\sin\theta_{13}\simeq 0.15$, is the generic outcome of minimal flavour structures. We present a few different incarnations of this statement, in terms of lepton mass matrices depending on a small number of parameters, that can be justified by discrete flavour symmetries. We also propose a general procedure to study the correlation between $\theta_{23}$, the absolute scale and ordering of the neutrino masses, and the leptonic CP-violating phases.

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]; Physique des Hautes Energies - Expérience [hep-ex]

Michele Frigerio, Albert Villanova del Moral. Minimal lepton flavour structures lead to non-maximal 2-3 mixing. Journal of High Energy Physics, 2013, 07, pp.146. ⟨10.1007/JHEP07(2013)146⟩. ⟨hal-00803544⟩